<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>
<body>
    <div id="app">
       <p v-if="isActive">true</p>
       <p v-else>false</p>
       <p v-show="isActive">show</p>
       <button @click="switchAction">切换状态</button>

       <p v-if="num == 0">num 为 0</p>
       <p v-else-if="num == 1">num 为 1</p>
       <p v-else>num 非 0 非 1</p>
       <button @click="changeNum(0)">num 为 0</button>
       <button @click="changeNum(1)">num 为 1</button>
       <button @click="changeNum(2)">num 非 0 非 1</button>

    </div>

    <script>
        const app = Vue.createApp({
            data(){
                return{
                    isActive:true,
                    num:0
                }
            },
            methods:{
               switchAction(){
                   this.isActive = !this.isActive
                   console.log('this.isActive',this.isActive);
               },
               changeNum(number){
                   this.num = number
               }
            }
        })
        app.mount("#app")
    </script>
</body>
</html>